Pump.



H. C. FUHRMAN.

PUMP.

APPLICATION F|LED1uNl8.1912.

Patented Got. 26, 19l5.

3 SHEETS-SHEET l.

H. C. FUHRIVIAN.

PUMP.

APPLICATION r1LEp1uNE18,1912.

Patented Oct. 26, 1915.

3 SHEETS-SHEET 2.

H. C. FUHRIVIAN.

PUMP.

APPLICATION FILED JUNE I8, I9`I2.

Patented Oct. 26, 1915.

3 SHEETS-SHEET 3.

HERMAN C. FUHRMAN, OF CEDAR RAPIDS, IOWA, ASSIGNOR T0 THE TOKHEIM MFG. C0., 0F CEDAR RAPIDS, IOWA, A CORPORATION OF ARIZONA.

PUMP.

Specification of Letters Patent.

Patented tUct. 26,1915.

Application led June 18, 1912. Serial No. 704,374.

To all whom 1f may concern:

Be it known that I, HERMAN C. Funn- MAN, a citizen of the United States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented new and useful Improvements in Pumps, of which the following is a full, clear, concise, and exact description', reference being had to the accompanying drawing, forming apart of this specification.

My invention relates to improvements 1n self-measuring oil pumps. It has particularly toy do with that class of measuring pumps wherein a predetermined quantity of oil is measured and discharged both on the up and down stroke of the piston of the pump.

@ne of the objects of my invention 1s to provide a pump of this character in which the measurement is accurate and in Which the variation in discharge by the pump will be reduced to a minimum.

Another object of my invention is to provide a pump which may be readily disassembled for the purpose of repair, cleaning, etc., and which does notrequire an expert mechanic to reassemble, the parts being so constructed that no great mechanical ingenuity is required to reassemble the same after they have once been taken apart.

Forthe purpose of disclosing my invention, ll have illustrated one embodiment thereof in the accompanying drawings, in which- Figure lis a side elevation of my 1mproved pump; Fig. 2 is a side elevation of the cylinder casting thereof; Fig. 3 is a longitudinal section showing the interior construction of the pump; Fig. 4 is a sectional view taken on the line 4 4 yof Fig. 3; Fig. 5 is a sectional View taken on the line 5-5 of Fig. 3; Fig. 6 is a sectional view taken on the line 6 6 of Fig. 3; and Fig. 7 is a detail plan view of one of the gaskets and spreader plates of the piston.

Referring to the embodiment of the invention illustrated, ll provide a cylinder casting which comprises a pair of hollow standards 1 and 2 connected together at their top by an integrally formed top plate 3 and at their -bottom by an integrally formed bottom plate 4. The standards and top plates are all formed in one casting and are preferably of heavy galvanized iron. The cores or openings in the side standards l and 2 form by-passes for a purpose more fully hereinafter described. The inner sides of the side members are arch-shaped as at 5 to closely fit around the central cylinder 6 which is preferably formed of heavy brass. The top and bottom plates 3 and 4 are provided with top and bottom openings, and the cylinder is slipped in position between the two side standards so that when the three members are assembled they form a central cylinder for the pump and a pair of by-passes.

Secured to the bottom of the cylinder casting is a bottom yhead 7, preferably hollow and divided by a web 8 to form a pair of chambers 9 and 10. Likewise secured to the top of the cylinder casting is a top head 11- also hollow and divided by a web 12 into a pair of chambers 18 and 14. .The chamber 9 communicates through an opening 15 with a by-pass 16 in the side member 2. The chamber 10 communicates through an opening 17 with the bottom of the cylinder 6, and through a valve port 18 and opening 19 with a by-pass 20 formed in the side standard l. rllhe chamber 13 communicates through an .opening 21 with the by-pass 16 and through a valve port 22 with the top of the cylinder 6. The chamber 14 communicates through an opening 23 with the'by-pass 20 and through alvalve port 24 with the top of the cylinder 6. 'llhis chamber' 14 likewise communicates through an opening 25 with a suitable discharge nozzle or faucet. rlhe chamber 9 communicates through a pipe 26 with a suitable storage tank or the like for the material, and this pipe 26 at its lower end is provided with a valve to Prevent the liquid when once raised in the pipe from flowing back into the reservoir.

The pump is supported upon a suitable standard 27 and is preferably held in position by downwardly extending projections 28 integrally cast on the bottom head 7.. It will be noted from the construction thus far described that all of the valves are suitably supported in top and bottom heads and that these heads may be readily placed in position and clamped by means of suitable bolts extending through Hanges 28a on the top and bottom pla-tes 3 and 4. It will also be noted that the parts may be readily secured in position and that I have dispensed entirely with stud rods, clamping rods and the like for holding the various parts together and which render 1t practically impossible for a layman to assemble -apum.

Thepliquid is forced through the various parts of the pump by a piston 28h, which comprises a central stiii'ening plate 29 secured upon a screw-.threaded stub 30. Arranged upon thisp-lalte is an upper gasket 31, held in position by a locking plate 32, and between the locking plate 32 and leather gasket 31 is arranged a brass spring spreader plate 33, and this plate, as will be seen 1n `Fig. 7, is preferably a disk-shaped brass plate having its edges notched as at 38 all the way around to form a plurality of sprlng fingers 39. These spring fingers hold Ithe leather gasket tightly against the wall of the cylinder and spread out as the leather wears, whereby the edges of the gasket are in constant contact with lthe cylinder walls, insuring a good suction and accuracy of `measurement, as long. as the leather of the gasket lasts. A. second leather gasket 40 having a clamping plate 41 and spreader plate 42 similar to the spreader` pla-te 33 in construction, is provided. In assembling, the plate 41 is screwed on the stub 30, then the spreader 42 is placed in position, the gasket 40 is next slipped over the stud and then the stii'ening plate 29, after which the gasket 31, the spreader 33 and the plate 32 are respectively placed in position. These parts are then all forced together by a nut 40al and the stub 30 is screwed upon the lower end of a piston lrod 43 adapted to extend up through the top head 11, suitable glands 44 and 45 being provided to prevent leakage where the rod passes through the head, and is provided at its upper end with a rack 46 guided at its upper end in the top of the frame 47. This frame carries at its upper end a suitable pinion 48 meshing with the rack 46 and mounted on a shaftcarrying the gear 48, which is driven from the pinion 49 operated by the handle 50.

The valve port 18 is closed by a puppetvalve 51 which is so located with respect to the port that it permits the liquid to pass upwardly therethrough but prevents the liquid from passing downwardly therethrough. A similar valve port and valve 52 connects the lower end of the cylinder 6 with the chamber 9, this valve being also so arranged that the liquid while being permited to pass up through the valve cannot passadownwardly therethrough. The valve port 24 is controlled by a puppet-valve 53 .which is so arranged that while the liquid can pass up through the valve it cannot pass back downwardly again, but the valve port 22 is controlled by a swing valve 54 pivoted at 55 on theend of an arm 56, which arm is supported by the gland 45. The rear end of this arm is provided with a counterbal- -valve port 52, which will anced weight 58 which serves to keep the valve closed and aids in closing the valve against the movement of the liquid upwardly through the valve after it has once passed therethrough. In operation, assuming the parts to be in the position illustrated in F ig. 3, by turning the crank to raise the piston the oil already contained in the cylinder 6 above Ithe piston will be forced out through the valve port 24 and discharged through the opening 25, the valve port 22 being closed against the discharge of oil by the clap valve 54. At the same time, oil is sucked up by the piston through the supply pipe 26, the chamber 9 and valve port 52 into the bottom of the cylinder. A reversal of the opera-tion of the handle after the full amount of oil contained in the top of the cylinder is discharged causes the piston to descend, thereby forcing the oil which is contained in the bottom of the cylinder out through the discharge opening 17, the valve port 18 and opening 19 through a by pass 20 into the chamber 14, and from thence out by way of the discharge opening 2 5. At the same time, the down stroke of the piston will suck in the oil from the supply pipe 26 through the chamber 9 -and through the opening 15 by way of the bypass`16 and opening 21 into the chamber 13, and thence by way of the valve port 22 into the top of the cylinder again, to be discharged on the next up stroke of the piston. It will be noted from the above description that the by-passes 16 and 20 are not used on the up stroke of the piston.

Due to the fact that the piston rod 43 occupies a certain amount of space in the cyllnderpon the upper side of the piston, there will be a slight variation in the amount of oil taken in on the up stroke of the piston and on the down stroke of the piston. That is, the piston rod 43 will occupy a certain amount of space, thereby decreasing the amount of oil taken in on the down' stroke of the piston slightly. To provide for this and make the amount delivered onboth the up and down stroke exactly the same, the valve port 52 is adapted to be closed by a puppet-valve, and the valve port 22 is adapted to be closed by a clap valve. The puppet-valve acts a little slower in seating than the clap valve, therefore before the puppet-valve is seated a slight amount of liquld will pass back out of the compensate for the difference in the amounts above and below the piston. 1n actual practice, to make these amounts equal, a slightly greater amount of oil is adapted to be taken in on the up stroke of the piston than on the down stroke of the piston, and this slightly greater amount is permitted to pass back and through the valve port 52 before the puppet-valve controlling the same seats.

meme@ @n the other hand, on the down stroke of the piston eXactly the proper amount is taken in, and due to the fact-that the clap valve 45 seats immediately no liquid will pass back through the valve port 22. Byl

this arrangement I insure accurate measurement on the part of the pump and insure the same quantity being delivered on the up stroke as on the down stroken Having thus described my invention, what l claim as new and desire to securevby lietters Patent is- 1. In a self-measuring pump, the combination with a cylinder casting comprising top and bottom plates having integrally formed therewith a plurality of hollow side stems to form by-passes, of a cylinder arranged in said casting and between said standards, upper and lower chambered heads secured to said plates, and a piston operating in said cylinder.

2. ln a self-measuring oil pump, thecombination with a cylinder casting comprising top and bottom plates having a central aperture therein and a plurality of integrally formed hollow side standards, of a cylinder arranged in said casting and between said standards, upper and lower chambered heads secured to said plates, and a piston operating in said cylinder.

3. In a self-measuring oil pump, the combination with a cylinder casting comprising top and bottom plates having integrally formed therewith a plurality of hollow side standards, said standards having their inner sides arc-shaped, of a vcylinder arranged in said casting and fitting between said arcshaped sides, upper and lower chambered heads secured toisaid plates, and a piston operating in said cylinder.

In witness whereof, l have hereunto subscribed my name in the presence of two witnesses.

HERMAN C. FUHRMAN.

Witnesses:

A. E. SCHULTE, C. E. AURACHER. 

